show pie chart on click of bar chart(chart drilldown)

[vinaynijhawan]

This fiddle is using classic c3js using javascript which has access to chart and d3 object.
http://jsfiddle.net/ox2grL5a/

how do i get access to 'chart' and 'd3' object using your directive?

do you have some fiddle for same functionality using your directive, which shows another chart when user use click event of other chart? its similar to drilldown charting functionality where chart can drilldown to its children like Tables/table/columns/column? or universe,country,states,cities/

example code from fiddle:
chart = generatePieChart(data); or d3.select('#btnShowBar').style('display','block');

Thanks